CN119651826A

CN119651826A - Switching circuit and mobile device

Info

Publication number: CN119651826A
Application number: CN202411664506.2A
Authority: CN
Inventors: 卢玉华; 何述宏; 彭新星; 文义斌; 李贻群
Original assignee: Pengyuansheng High Tech Co ltd
Current assignee: Pengyuansheng High Tech Co ltd
Priority date: 2024-11-20
Filing date: 2024-11-20
Publication date: 2025-03-18

Abstract

The invention discloses a switching circuit and mobile equipment, which relate to the technical field of switching circuits, wherein the switching circuit is used for the mobile equipment, the mobile equipment comprises a battery and an inverter connected with the battery, the inverter is provided with an electrolytic capacitor, and the switching circuit comprises a main control chip, a main switching circuit and an auxiliary switching circuit. The main control chip is connected with the battery, the main switch circuit is respectively connected with the load and the main control chip and used for controlling the conduction or the cut-off of a passage between the battery and the load, the auxiliary switch circuit is respectively connected with the electrolytic capacitor and the main control chip and used for controlling the conduction or the cut-off of the passage between the battery and the electrolytic capacitor according to the control instruction when the control instruction is received, and the auxiliary switch circuit is also used for controlling the conduction of the main switch circuit when the control instruction represents the conduction and the electric energy of the electrolytic capacitor reaches a first preset value. The technical scheme provided by the invention can ensure that the battery is controlled to be completely powered off when the mobile equipment receives the power-off signal, so that the service life of the mobile equipment is prolonged.

Description

Switching circuit and mobile device

Technical Field

The present invention relates to the field of switching circuits, and in particular, to a switching circuit and a mobile device.

Background

At present, mobile devices, particularly mobile power supplies, have the advantages that a switch key only can turn off a screen display, and the power supply of a BMS in the mobile power supplies cannot be completely turned off, so that an auxiliary power supply in the mobile power supplies always consumes the electric quantity of a battery pack, and finally the service life of the battery is influenced.

Therefore, the mobile device in the prior art has a problem of low battery life, resulting in a low service life of the mobile device.

Disclosure of Invention

The invention mainly aims to provide a switching circuit and mobile equipment, and aims to improve the service life of the mobile equipment.

In order to achieve the above object, the present invention provides a switching circuit for a mobile device, the mobile device including a battery and an inverter connected to the battery, the inverter having an electrolytic capacitor, the battery being further connected to a load, the switching circuit comprising:

The main control chip is connected with the battery;

the main switch circuit is connected with the main control chip and used for controlling the connection or disconnection of a passage between the battery and the load;

The auxiliary switch circuit is connected with the main control chip and is used for controlling the connection or disconnection of the passage between the battery and the electrolytic capacitor according to the control instruction when the control instruction is received;

The auxiliary switch circuit is also used for controlling the main switch circuit to be conducted when the control instruction characterizes to be conducted and the electric energy of the electrolytic capacitor reaches a first preset value.

In an embodiment, when the main switch circuit is in an on state, the auxiliary switch circuit is further used for controlling the main switch circuit to be turned off after receiving a control instruction representing the turn-off.

In one embodiment, the secondary switching circuit includes:

An instruction receiving circuit for receiving the control instruction;

The controlled end of the first connecting circuit is connected with the output end of the instruction receiving circuit, and the first connecting circuit is respectively connected with the electrolytic capacitor and the main control chip;

The instruction receiving circuit is used for controlling the first connecting circuit to be conducted when the control instruction represents conduction.

In an embodiment, the switch circuit further includes a control module, and the instruction receiving circuit is configured to control, when the control instruction indicates on, the first connection circuit to be turned on through the control module;

The instruction receiving circuit comprises a first photoelectric coupler, a first resistor, a second resistor, a third resistor, a fourth resistor, a first switch and a first power tube, wherein a first interface of the first photoelectric coupler is connected with the battery, a second interface of the first photoelectric coupler is connected with a first end of the first resistor, a third interface of the first photoelectric coupler is connected with a first end of the second resistor and a signal receiving end of a control module, a fourth interface of the first photoelectric coupler is connected with a first power supply, a second end of the second resistor is grounded, a second end of the first resistor is connected with a first end of the first switch, a second end of the first switch is connected with a first end of the third resistor and a base electrode of the first power tube, a second end of the third resistor and a collector electrode of the first power tube are grounded, and an emitter electrode of the first power tube is connected with the first connecting circuit through the fourth resistor;

The first connection circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, an eleventh resistor, a second power tube, a third power tube and a fourth power tube, wherein the first end of the fifth resistor and the emitter of the second power tube are connected with the battery, the second end of the fifth resistor and the base of the second power tube are connected with the fourth resistor of the instruction receiving circuit, the collector of the second power tube is connected with the first end of the sixth resistor, the second end of the sixth resistor is connected with the first end of the seventh resistor and the base of the third power tube, the second end of the seventh resistor and the collector of the third power tube are connected with the RSNSP interface of the master chip, the first end of the tenth resistor, the first end of the ninth resistor and the collector of the fourth transistor, the emitter of the third power tube is connected with the first end of the fourth power tube and the eleventh resistor through the eighth resistor, the second end of the second power tube is connected with the base of the master chip, the second end of the third power tube is connected with the third resistor is connected with the base of the master chip, the third resistor is connected with the third interface of the host chip, the third interface is connected with the third interface of the third interface.

In an embodiment, the secondary switch circuit further includes a charging circuit, and the charging circuit is connected to the instruction receiving circuit, and is configured to control the secondary switch circuit and the primary switch circuit to be turned on respectively after the secondary switch circuit is connected to an external power supply.

The charging circuit comprises a second photoelectric coupler, a twelfth resistor and a thirteenth resistor, wherein a first interface of the second photoelectric coupler is used for being connected with an external power supply, a second interface of the second photoelectric coupler is grounded through the twelfth resistor, a third interface of the second photoelectric coupler is connected with a second end of the first switch, a first end of the third resistor and a base electrode of the first power tube, and a fourth interface of the second photoelectric coupler is connected with the battery through the thirteenth resistor.

In an embodiment, the switch circuit further includes a control module, and the main switch circuit includes a third optocoupler, a fifth power tube, a sixth power tube, a seventh power tube, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, and a twenty first resistor;

the first interface of the third photoelectric coupler is connected with a second power supply, the second interface of the third photoelectric coupler is connected with an emitter of the fifth power tube through the fourteenth resistor, a collector of the fifth power tube is connected with a first end of the fifteenth resistor and then grounded, a base of the fifth power tube is connected with a second end of the fifteenth resistor and a first end of the sixteenth resistor, a second end of the sixteenth resistor is connected with the control module, a power input end of the control module is connected with the auxiliary switch circuit, a fourth interface of the third photoelectric coupler is connected with the battery, a third interface of the third photoelectric coupler is connected with a first end of the eighteenth resistor and a base of the sixth power tube through the seventeenth resistor, an emitter of the sixth power tube is connected with the nineteenth resistor and the first end of the twentieth resistor, a second end of the nineteenth resistor is grounded, a second end of the twenty-seventh resistor is connected with a base of the seventeenth resistor and a collector of the twenty-eighth resistor, and a base of the twenty-eighth resistor is connected with a base of the twenty-eighth resistor, and a base of the twenty-eighth resistor.

In an embodiment, the switch circuit further includes a discharge port, the battery is connected to a first end of the first diode and a first interface of the discharge port, a second end of the first diode is connected to a VDD interface of the main control chip, and a second interface of the discharge port is grounded.

In an embodiment, the model of the master control chip is TMI4101.

The invention also provides a mobile device comprising a switching circuit as claimed in any one of the preceding claims.

In summary, the switch circuit simultaneously realizes soft start when the mobile device is started and complete shutdown of the battery when the mobile device is shut down, so as to prolong the service life of the mobile device. Specifically, the battery of the mobile device is connected with the electrolytic capacitor and the load of the inverter, and the auxiliary switch circuit is used for enabling the main control chip to open the paths of the battery and the electrolytic capacitor for soft start when the battery reaches a first preset value, outputting electric energy to the main switch circuit, enabling the main switch circuit to be also conducted, and enabling the main control chip to open the paths between the battery and the load to supply power for the load. When a starting signal is received, the main switch circuit and the auxiliary switch circuit are cut off, so that the main control chip controls the cut-off of the passage between the battery, the load and the electrolytic capacitor. Therefore, soft start is realized at the same time when the mobile device is started, and the battery is completely closed when the mobile device is shut down, so that the service life of the mobile device is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a switch circuit according to an embodiment of the present invention;

Fig. 2 is a circuit diagram of an embodiment of a switching circuit according to the present invention.

Reference numerals illustrate:

100. The main control chip comprises a main control chip body, a main switch circuit body and an auxiliary switch circuit body.

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear are referred to in the embodiments of the present invention), the directional indications are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a specific posture, and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, if "and/or" and/or "are used throughout, the meaning includes three parallel schemes, for example," a and/or B "including a scheme, or B scheme, or a scheme where a and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

In particular, the current mobile power supply has a significant technical disadvantage in that the on-off key thereof generally can only turn off the screen display and cannot completely cut off the power supply of the internal Battery Management System (BMS), resulting in that the auxiliary power supply continues to operate and consume the battery power even in the off state. This may not only lead to a depleted battery charge during prolonged periods of non-use or sea operation, but may also affect the overall life of the battery. In addition, for those mobile power sources capable of realizing complete power failure, when the mobile power sources are restarted, large current is generated in the instant charging process of the large-capacity electrolytic capacitor in the internal inverter module, and the transient current can be misjudged as output short circuit by the BMS, so that an overcurrent protection mechanism is triggered, and the service life of the battery and the normal operation of equipment are further influenced. Under the combined action of the factors, the service life of the mobile equipment is reduced, and the reliability of the mobile power supply and the use experience of users are also reduced.

In order to improve the service life of the mobile device, the invention provides a switching circuit which is used for the mobile device, wherein the mobile device comprises a battery and an inverter connected with the battery, the inverter is provided with an electrolytic capacitor, and the battery is also used for connecting a load to supply power for the load. It is understood that mobile devices refer to those electronic devices that are designed to be portable and capable of operating for a period of time without a fixed power source. Such devices typically include smartphones, tablet computers, notebook computers, smartwatches, portable game consoles, and the like. The mobile device may also be a mobile power supply, which is a portable power supply device that is specifically used to charge other mobile devices.

Further, mobile devices, particularly mobile power sources, include a battery and a BMS, wherein the battery and the BMS are connected, the battery is used for storing electric energy, a common battery type is a lithium ion battery or a lithium polymer battery because of their high energy density and long cycle life, and the BMS is responsible for monitoring the state of the battery, such as voltage, current, temperature, etc., and providing overcharge protection, overdischarge protection, short circuit protection, etc., to ensure safe use.

Referring to fig. 1, in an embodiment, the switch circuit includes a main control chip 100, a main switch circuit 200 and a sub switch circuit 300, wherein the main control chip 100 is connected with the battery, the main switch circuit 200 is connected with the main control chip 100 and is used for controlling the on or off of a path between the battery and a load, the sub switch circuit 300 is connected with the main control chip 100 and is used for controlling the on or off of a path between the battery and the electrolytic capacitor according to the control command when the control command is received, and the sub switch circuit 300 is also used for controlling the on of the main switch circuit 200 when the control command represents the on and the electric energy of the electrolytic capacitor reaches a first preset value.

In this embodiment, the main control chip 100 may be designed based on a Microcontroller (MCU) or an Application Specific Integrated Circuit (ASIC), which integrates a processing unit, a memory, an input/output interface, and possibly an analog front end. The processing unit is responsible for executing preprogrammed logic and algorithms, the memory is used to store program code and data, and the input/output interface allows the main control chip 100 to communicate with external sensors, switching circuitry, and other components.

Further, the main control chip 100 can control the battery to output, alternatively, the main control chip 100 can use a TMI4101 chip, and the control pins of the TMI4101 chip have the functions that when the CTL of the TMI4101 chip is suspended, the discharge tube driving pins of the TMI4101 output a high level, the battery pack can discharge normally, and when the CTL is pulled to a low level, the discharge tube driving pins of the TMI4101 output a low level, and the battery cannot discharge.

In this embodiment, the main switching circuit 200 may be composed of one or more power MOSFETs (metal-oxide-semiconductor field effect transistors) which can be rapidly switched on or off in case of need for conduction.

It will be appreciated that in this embodiment, the main switch circuit 200 is mainly used to control the conduction or closing of the path between the battery loads, and specifically, when the main switch circuit 200 receives a conduction command, it will conduct and make the corresponding level flow to the main control chip 100, and when the main control chip 100 receives the level, it controls the battery to output. For example, when the main control chip 100 is a TMI4101 chip, the main switch circuit 200 controls CTL of the TMI4101 chip to hang when receiving the on command, and the battery can start discharging. If the main switch circuit 200 does not receive the on command or the off command, the CTL of the TMI4101 chip is pulled to low level, the battery is powered off, and no discharge can be performed. Thus, the main switch circuit 200 is matched with the main control chip 100 to realize the control of the conduction or closing of the passage between the battery and the load, when the user closes the mobile device, the main switch circuit 200 feeds back the corresponding signal to the main control chip 100, and the main control chip 100 controls whether the passage is conducted or not, so that the battery can be prevented from outputting electric energy in the shutdown state.

In this embodiment, the auxiliary switch circuit 300 may also be a power MOSFET or other type of switch device, which is responsible for controlling the connection between the battery and the electrolytic capacitor, for smooth transition during the power-on process, so as to avoid large current impact caused by instantaneous charging of the electrolytic capacitor, and at the same time, avoid the influence of large current on the internal components of the mobile device.

Further, the main switch of the mobile device may be disposed in the auxiliary switch circuit 300, and when a power-on command is received, the auxiliary switch circuit 300 is turned on first, so that the battery starts to charge the electrolytic capacitor. At this stage, the main switching circuit 200 remains in the off state to prevent large current surge caused by directly supplying power to the load. The secondary switching circuit 300 continues to monitor the voltage of the electrolytic capacitor until it reaches a first predetermined value (e.g., the electrolytic capacitor fills to a certain proportion). Once the voltage of the electrolytic capacitor reaches the first preset value, the auxiliary switch circuit 300 will send a corresponding signal to the main control chip 100, indicating the main control chip 100 to control the main switch circuit 200 to be turned on. At this time, the battery stably supplies power to the load through the electrolytic capacitor, so that the current in the starting process is ensured to be stable, and the impact on the BMS and the battery is reduced. Alternatively, the first preset value may be 0 or greater than 0.

Optionally, the switching circuit may further include auxiliary circuits, such as a comparator or an ADC (analog-to-digital converter), for monitoring the voltage level of the electrolytic capacitor and determining whether to trigger the operation of the main switching circuit 200 according to a set threshold.

In summary, the switch circuit simultaneously realizes soft start when the mobile device is started and complete shutdown of the battery when the mobile device is shut down, so as to prolong the service life of the mobile device. Specifically, the battery of the mobile device is connected to the electrolytic capacitor and the load, and the auxiliary switch circuit 300 is used for enabling the main control chip 100 to open the path between the battery and the electrolytic capacitor for soft start when the electrolytic capacitor reaches a first preset value, outputting electric energy to the main switch circuit 200, enabling the main switch circuit 200 to be also turned on, and enabling the main control chip 100 to open the path between the battery and the load for supplying power to the load. When the power-on signal is received, the main switch circuit 200 and the auxiliary switch circuit 300 are turned off, so that the main control chip 100 controls the cut-off of the paths between the battery and the load and the electrolytic capacitor. Therefore, soft start is realized at the same time when the mobile device is started, and the battery is completely closed when the mobile device is shut down, so that the service life of the mobile device is prolonged.

In an embodiment, when the main switch circuit 200 is in an on state, the auxiliary switch circuit 300 is further configured to control the main switch circuit 200 to be turned off after receiving a control instruction indicating to be turned off.

It will be appreciated that the auxiliary switch circuit 300 is further configured to control the main switch circuit 200 to be turned off after receiving a control command indicating the turn-off when the main switch circuit 200 is in the on state. This design ensures that during shutdown, not only is the connection between the battery and the electrolytic capacitor cut off, but also the connection between the battery and the load is completely cut off, thus achieving a true complete shutdown. Thus, the self-discharge and static power consumption of the battery can be reduced to the maximum extent, and the service life of the battery can be prolonged.

Further, there may be a control flow in which the user presses a power-off button on the mobile power supply or issues a power-off instruction by other means, and the sub-switching circuit 300 immediately turns off after directly receiving the power-off instruction, thereby cutting off the connection between the battery and the electrolytic capacitor. At this time, the auxiliary switch circuit 300 also transmits a cut-off signal to the main switch circuit 200, and the main control chip 100 controls the main switch circuit 200 to cut off after receiving the signal of the auxiliary switch circuit 300, thereby cutting off the connection between the battery and the load. At this time, all connections between the battery and the electrolytic capacitor and the load are cut off, the system enters a fully closed state, no current flows, and a true full closing is achieved, thereby reducing static power consumption and extending battery life.

In an embodiment, the auxiliary switch circuit 300 may specifically include an instruction receiving circuit and a first connection circuit. The command receiving circuit is used for receiving the control command, the controlled end of the first connecting circuit is connected with the output end of the command receiving circuit, the first connecting circuit is respectively connected with the electrolytic capacitor and the main control chip 100, and the command receiving circuit is used for controlling the first connecting circuit to be conducted when the control command represents conduction.

It will be appreciated that the sub-switching circuit 300 may include, in particular, an instruction receiving circuit and a first connection circuit. The command receiving circuit may include a main switch through which a user controls the switching on and off of the mobile device, and the controlled end of the first connection circuit is connected with the output end of the command receiving circuit, and the first connection circuit is connected with the electrolytic capacitor and the main control chip 100, respectively. When the control command represents conduction, the command receiving circuit controls the first connecting circuit to be conducted. This design enables the sub-switching circuit 300 to precisely control the connection between the battery and the electrolytic capacitor according to the instruction of the main control chip 100. By the mode, soft start can be realized in the starting process, and large current impact caused by instant charging of the electrolytic capacitor is avoided, so that the internal elements are protected from damage. In addition, when the secondary switch circuit 300 is turned off, the connection between the battery and the electrolytic capacitor can be completely cut off, static power consumption can be reduced, and the service life of the battery can be prolonged. The fine control not only improves the reliability and the safety of the system, but also optimizes the energy management and improves the overall performance and the user experience of the mobile equipment.

In an embodiment, as shown in fig. 2, the switch circuit further includes a control module M1, and the instruction receiving circuit is configured to control the first connection circuit to be turned on through the control module M1 when the control instruction indicates to be turned on;

The instruction receiving circuit comprises a first photoelectric coupler U1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first switch and a first power tube Q1, wherein a first interface of the first photoelectric coupler U1 is connected with the battery, a second interface of the first photoelectric coupler U1 is connected with a first end of the first resistor R1, a third interface of the first photoelectric coupler U1 is connected with a first end of the second resistor R2 and a signal receiving end of a control module M1, a fourth interface of the first photoelectric coupler U1 is connected with a first power supply, a second end of the second resistor R2 is grounded, a second end of the first resistor R1 is connected with a first end of the first switch, a second end of the first switch is connected with a first end of the third resistor R3 and a base electrode of the first power tube Q1, a second end of the third resistor R3 and a signal receiving end of the first power tube Q1 are connected with a collector electrode of the fourth resistor Q1, and the fourth resistor Q4 is connected with the first power tube Q1 through the collector electrode;

The first connection circuit comprises a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a second power tube Q2, a third power tube Q3 and a fourth power tube Q4, wherein the first end of the fifth resistor R5 and the emitter of the second power tube Q2 are connected with the battery, the second end of the fifth resistor R5 and the base of the second power tube Q2 are connected with the fourth resistor R4 of the instruction receiving circuit, the collector of the second power tube Q2 is connected with the first end of the sixth resistor R6, the second end of the sixth resistor R6 is connected with the first end of the seventh resistor R7 and the base of the third power tube Q3, the second end of the seventh resistor R7 and the collector of the third power tube Q3 are connected with the interface of the master chip, the second end of the fifth resistor R5 and the base of the fourth resistor Q2 are connected with the fourth end of the master chip, the fourth end of the fourth resistor R9 and the emitter of the fourth resistor Q3 are connected with the master chip, the fourth end of the fourth resistor R9 is connected with the base of the fourth resistor Q11 is connected with the third end of the master chip, and the fourth resistor Q11 is connected with the fourth end of the third resistor Q11.

It will be appreciated that conventional charging mechanisms in the off state typically require complex circuit designs to ensure that the BMS is able to properly identify the external power source and activate the charging process. Such complex circuit designs not only increase manufacturing costs, but may introduce more points of failure, affecting the reliability and stability of the system. Therefore, in this embodiment, the charging circuit is added to the sub-switching circuit, and the main switching circuit and the sub-switching circuit can be turned on after the charging circuit is powered on by the dc power supply.

In an embodiment, as shown in fig. 2, the switch circuit further includes a control module M1, the instruction receiving circuit is configured to control the first connection circuit to be turned on through the control module M1 when the control instruction is characterized to be turned on, the charging circuit includes a second photo-coupler U2, a twelfth resistor R12, and a thirteenth resistor R13, a first interface of the second photo-coupler U2 is configured to be connected to an external power source, a second interface of the second photo-coupler U2 is grounded through the twelfth resistor R12, a third interface of the second photo-coupler U2 is connected to a second end of the first switch, a first end of the third resistor R3, and a base of the first power tube Q1, and a fourth interface of the second photo-coupler U2 is connected to the battery through the thirteenth resistor R13.

In an embodiment, the switch circuit further includes a control module M1, and the main switch circuit includes a third photo-coupler U3, a fifth power transistor Q5, a sixth power transistor Q6, a seventh power transistor Q7, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, and a twenty-first resistor R21;

The first interface of the third optocoupler U3 is connected to a second power supply, the second interface of the third optocoupler U3 is connected to the emitter of the fifth power tube Q5 through the fourteenth resistor R14, the collector of the fifth power tube Q5 is connected to the first end of the fifteenth resistor R15 and then grounded, the base of the fifth power tube Q5 is connected to the second end of the fifteenth resistor R15 and the first end of the sixteenth resistor R16, the second end of the sixteenth resistor R16 is connected to the control module M1, the power input end of the control module M1 is connected to the sub-switching circuit, the fourth interface of the third optocoupler U3 is connected to the battery, the third interface of the third optocoupler U3 is connected to the first end of the eighteenth resistor R18 and the base of the sixth power tube Q6 through the seventeenth resistor R17, the emitter of the sixth power tube Q6 is connected to the ninth resistor R19 and the first end of the nineteenth resistor R20, the second end of the nineteenth resistor R20 and the collector of the seventeenth resistor R7 is connected to the base of the seventeenth resistor R7, and the seventeenth resistor R7 is connected to the base of the seventeenth resistor R7 and the base of the seventeenth resistor Q7 is connected to the base of the seventeenth resistor R7.

In an embodiment, as shown in fig. 2, the switch circuit further includes a discharge port, the battery is connected to the first end of the first diode and the first interface of the discharge port, the second end of the first diode is connected to the VDD interface of the main control chip, and the second interface of the discharge port is grounded.

It can be understood that when the main switch circuit and the auxiliary switch circuit are conducted, the main control chip controls the battery to output electric energy through the output voltage of the discharge port.

In an embodiment, the model of the master control chip is TMI4101.

By combining all the above embodiments, the whole circuit diagram shown in fig. 2 can be obtained, and an application example is given for the circuit of fig. 2, when the key is needed to be turned on in the off state: by touching the first switch short circuit, P+ voltage (namely battery positive voltage) is discharged to the outside through the first interface of the first photoelectric coupler U1 to the second interface pin, the first resistor R1 to the first switch to the g pole of the first power tube Q1, then the D-s of the first power tube Q1 is conducted, at this moment, the first power tube Q1 is conducted by negative voltage due to the g-s pole, the P+ voltage is conducted by the soft start second power tube Q2 driven by the first power tube Q1, the battery voltage is discharged to the outside through the eighth resistor R8 (soft start resistor) +the third power tube Q3 (soft start power tube), at this moment, large current is not caused by soft start charging of the battery end electrolytic capacitor of the inverter, after the voltage is arranged between P+ and GND, the control module M1 supplies power to 5V, then the control module M1 sends out 1 high 410to the g pole of the fifth power tube Q5, the D-s of the fifth power tube Q5 is conducted, the second photoelectric coupler U2 is driven by the soft start resistor P2, the voltage is changed to the off by the seventh voltage due to the fact that the P-s of the second photoelectric coupler U2 is conducted by the negative voltage, the P4 is not conducted by the second power tube Q3, the voltage is changed to the P-s of the P4, and the voltage is changed to the P4 is not conducted by the P4, and the D is conducted by the P4, the P is conducted by the P6, at this time, the battery pack can be normally discharged.

An application example is given, when the key is required to be turned off in the on state, the key is pressed for 3 seconds, the first interface to the second interface pin on the primary side of the first photoelectric coupler U1 is conducted, at this time, the second third interface to the fourth interface of the photoelectric coupler U3 is short-circuited, the 5V power supply is sent to the input port of the control module M1, after the control module M1 recognizes the high level, the high level sent to the sixteenth resistor R16 is lowered, the g pole voltage of the fifth power tube Q5 is lowered to cause the D-s pole of the fifth power tube Q5 to be non-conducted, no current flows through the second third interface to the fourth interface pin of the third photoelectric coupler U3, at this time, the g pole voltage of the sixth power tube Q6 is lowered, D-s is not conducted any more, the P+ voltage is raised, the nineteenth resistor R19 is raised to the g pole of the twenty-seventh power tube Q7, the D-s pole of the seventh power tube Q7 is turned on, the TMI 1D pin is pulled down to cause the D-s pole of the fifth power tube Q5 to be non-conducted, and the discharging function of the fourth power tube Q4 can not be realized at this time, and the power tube Q4 can not be discharged.

When the DC charging is accessed in the shutdown state, the DC input voltage is conducted to the second interface pin through the primary side first interface of the second photoelectric coupler U2, the thirteenth resistor R13 generates primary side current to enable the secondary side of the first photoelectric coupler U1 to conduct, then P+ voltage, the twelfth resistor R12, the third interface to the fourth interface of the first photoelectric coupler U1, the g pole of the first power tube Q1, D-s of the first power tube Q1 is conducted, at this moment, the first power tube Q1 is conducted due to the negative pressure of the g pole and s pole, the P+ voltage is conducted through the soft start second power tube Q2 driven by the first power tube Q1, the battery voltage is discharged to the outside through the eighth resistor R8 (soft start resistor) +the third power tube Q3 (soft start power tube), the electrolytic capacitor of the battery end of the inverter is charged in a soft state and does not cause large current, after the voltage between the P+ and GND is applied, the control module M1 is powered by 5V, after the control module M1 is controlled, the second power tube Q1 is controlled to emit a low voltage, the second power tube Q2 is conducted due to the fact that the second power tube Q2 is conducted due to the negative pressure of the second power tube Q1 is turned on, the fifth power tube Q2 is turned on due to the fact that the second power tube Q2 is turned on through the soft start resistor R8 (soft start resistor) +third power tube Q3), the fifth power tube Q4 is conducted through the fifth power tube Q2 is turned on, and the fifth power tube Q2 is connected to the fifth power tube is turned on due to the fact that the fifth power tube Q2 is turned off through the fifth power tube is turned on, and the fifth power tube is turned off through the fifth end 6 is turned on through the soft start resistor R8 is turned off, at this time, the battery pack can be normally discharged.

In this way, through the above example, the switch circuit provided by the invention can realize three functions, namely, in the first and second power-off states, the switch circuit can completely cut off the connection between the battery and the load, ensure that the battery does not supply power to any external component any more, reduce static power consumption, prolong standby time and service life of the battery, in the second power-on process, the switch circuit charges the electrolytic capacitor in advance through the auxiliary switch circuit, avoid heavy current impact, ensure stable starting, so that internal elements can be protected, stress on the battery is reduced, and service life of the battery is prolonged, and in the third, when an external power supply is connected, the charge circuit can automatically detect and activate the charge process, and the auxiliary switch circuit and the main switch circuit are controlled to be respectively conducted, so that efficient charge management is realized.

It should be noted that the g-pole, d-pole, and s-pole mentioned above correspond to the gate, drain, and source, respectively, of the device.

The invention also provides a mobile device comprising a switching circuit as claimed in any one of the preceding claims. It should be noted that, the specific structure of the switch circuit of the mobile device refers to the above embodiments, and since the mobile device adopts all the technical solutions of all the above embodiments, at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be described in detail herein.

It will be appreciated that the mobile device may be a smart phone, tablet, notebook, smart watch, portable gaming device, mobile power supply, or the like. These devices are typically designed to be portable and capable of operating for a period of time without a fixed power source. Particularly, the portable power supply device special for charging other mobile devices can be widely applied to various scenes.

In this embodiment, the mobile device includes a battery, which may be a lithium ion battery or a lithium polymer battery.

The switch circuit is applied to the mobile equipment, and the auxiliary switch circuit is used for charging the electrolytic capacitor in advance in the starting process, so that the heavy current impact is avoided, the internal elements are protected, and the service life of the battery is prolonged. In the shutdown state, the main switch circuit and the auxiliary switch circuit are both cut off, so that the connection between the battery and the load as well as the electrolytic capacitor is thoroughly cut off, the static power consumption is reduced, and the standby time is prolonged. In a word, the damage to the battery is promoted, and the service life of the mobile device is prolonged.

The foregoing description is only exemplary embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the present invention.

Claims

1. A switching circuit for a mobile device, the mobile device comprising a battery and an inverter coupled to the battery, the inverter having an electrolytic capacitor, the battery further coupled to a load, the switching circuit comprising:

The main control chip is connected with the battery;

2. The switching circuit according to claim 1, wherein the secondary switching circuit is further configured to control the primary switching circuit to be turned off after receiving a control command indicative of being turned off when the primary switching circuit is in an on state.

3. The switching circuit according to claim 2, wherein the sub-switching circuit includes:

An instruction receiving circuit for receiving the control instruction;

4. The switching circuit according to claim 3, further comprising a control module, wherein the instruction receiving circuit is configured to control the first connection circuit to be turned on by the control module when the control instruction indicates to be turned on;

5. The switching circuit according to claim 3, wherein the sub-switching circuit further comprises a charging circuit connected to the instruction receiving circuit for controlling the sub-switching circuit and the main switching circuit to be turned on respectively after the external power supply is connected.

6. The switching circuit according to claim 5, further comprising a control module, wherein the instruction receiving circuit is configured to control the first connection circuit to be turned on by the control module when the control instruction indicates to be turned on;

7. The switching circuit of claim 1, further comprising a control module, wherein the main switching circuit comprises a third optocoupler, a fifth power tube, a sixth power tube, a seventh power tube, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, and a twenty first resistor;

8. The switching circuit of claim 1, further comprising a discharge port, wherein the battery is coupled to a first terminal of a first diode and a first interface of the discharge port, wherein a second terminal of the first diode is coupled to a VDD interface of the main control chip, and wherein a second interface of the discharge port is coupled to ground.

9. The switching circuit according to any one of claims 1 to 8, wherein the master control chip is of a model TMI4101.

10. A mobile device, characterized in that it comprises a switching circuit according to any of claims 1 to 9.